-
NASA's Juno spacecraft traveled to 645 miles above the surface of the solar system's largest moon, Ganymede, on Monday.
-
On Monday evening, Jupiter and Saturn appeared closer to each other in the sky than they have for hundreds of years in what has become known as the Great Conjunction.
-
At least, that's how it will look to someone craning their head aloft. On the winter solstice, the pair of gas giants will appear closer to each other in the night sky than they have in centuries.